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Oceanographic and Environmental Conditions in the Discovery Islands, British Columbia

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Oceanographic and Environmental Conditions in the Discovery Islands, British Columbia Canadian Science Advisory Secretariat (CSAS) Research Document 2017/071 National Capital Region Oceanographic and environmental conditions in the Discovery Islands, British Columbia P.C. Chandler1, M.G.G. Foreman1, M. Ouellet2, C. Mimeault3, and J. Wade3 1Fisheries and Oceans Canada Institute of Ocean Sciences 9860 West Saanich Road Sidney, British Columbia, V8L 5T5 2Fisheries and Oceans Canada Marine Environmental Data Section, Ocean Science Branch 200 Kent Street Ottawa, Ontario, K1A 0E6 3Fisheries and Oceans Canada Aquaculture, Biotechnology and Aquatic Animal Health Science Branch 200 Kent Street Ottawa, Ontario, K1A 0E6 December 2017 Foreword This series documents the scientific basis for the evaluation of aquatic resources and ecosystems in Canada. As such, it addresses the issues of the day in the time frames required and the documents it contains are not intended as definitive statements on the subjects addressed but rather as progress reports on ongoing investigations. Research documents are produced in the official language in which they are provided to the Secretariat. Published by: Fisheries and Oceans Canada Canadian Science Advisory Secretariat 200 Kent Street Ottawa ON K1A 0E6 http://www.dfo-mpo.gc.ca/csas-sccs/ [email protected] © Her Majesty the Queen in Right of Canada, 2017 ISSN 1919-5044 Correct citation for this publication: Chandler, P.C., Foreman, M.G.G., Ouellet, M., Mimeault, C., and Wade, J. 2017. Oceanographic and environmental conditions in the Discovery Islands, British Columbia. DFO Can. Sci. Advis. Sec. Res. Doc. 2017/071. viii + 51 p. TABLE OF CONTENTS LIST OF FIGURES ................................................................................................................... IV LIST OF TABLES ...................................................................................................................... VI ABSTRACT .............................................................................................................................. VII RÉSUMÉ ................................................................................................................................ VIII INTRODUCTION ........................................................................................................................1 PURPOSE OF THIS DOCUMENT ..............................................................................................1 PHYSICAL SETTING ..................................................................................................................2 OCEANOGRAPHIC CONDITIONS .............................................................................................4 TEMPERATURE, SALINITY AND OXYGEN .......................................................................... 4 Spatial and temporal variation ............................................................................................ 6 Subdiurnal variations .........................................................................................................17 WATER CURRENTS ............................................................................................................18 Tidal currents ....................................................................................................................20 Buoyancy currents .............................................................................................................20 Wind driven currents .........................................................................................................21 SOLAR RADIATION AND ULTRAVIOLET LIGHT ....................................................................24 BIOTA AND SUSPENDED SOLIDS ..........................................................................................27 MODELLING .............................................................................................................................28 HYDRODYNAMIC MODEL ...................................................................................................28 FVCOM simulations for April and July 2010 ......................................................................29 Comparison ADCP observations and 2010 FVCOM simulations .......................................30 Comparison of farm observations and 2010 FVCOM simulations ......................................35 Representativeness of April and July 2010 conditions .......................................................37 PASSIVE PARTICLE TRACKING MODEL ............................................................................41 RECOMMENDATIONS .............................................................................................................43 CONCLUSIONS ........................................................................................................................43 REFERENCES CITED ..............................................................................................................44 APPENDIX A: TEMPERATURE, SALINITY AND OXYGEN DATA ........................................... 47 APPENDIX B: SALINITY UNITS ...............................................................................................50 APPENDIX C: SOURCES OF DATA ........................................................................................50 OCEANOGRAPHIC ARCHIVES ...........................................................................................50 BC SALMON FARMERS ASSOCIATION DATABASE ..........................................................51 iii LIST OF FIGURES Figure 1. Atlantic Salmon fish farms and place names of significant waterways in the Discovery Islands. ...................................................................................................................................... 3 Figure 2. Colour contours of bottom depth for the Discovery Islands area based on bathymetric data provided by the Canadian Hydrographic Service. ............................................................... 4 Figure 3. Map of the Discovery Islands showing regions based on geographical and water properties (salinity, temperature and oxygen). ........................................................................... 6 Figure 4. Water temperature observations between 0 and 30 m (light blue dots) and 30 to 60 m depth (dark blue open circles) in different regions of the Discovery Islands plotted by day of year. ........................................................................................................................................... 7 Figure 5. Water temperature observed on Atlantic Salmon farms located in the Discovery Islands. ...................................................................................................................................... 8 Figure 6. Vertical distribution of temperature in the nine regions of the Discovery Islands from oceanographic profiles collected between 1932 and 2015. ........................................................ 9 Figure 7. Water salinity (blend of data in PSS-78 and g kg-1 equivalent units for historical data; see Appendix B) observed between 0 and 30 m (light blue dots) and 30 to 60 m depth (dark blue open circles) in different regions of the Discovery Islands. ................................................11 Figure 8. Water salinity observed on Atlantic Salmon farms located in the east-west connecting channels of the Discovery Islands. ............................................................................................12 Figure 9. Vertical distribution of salinity in the nine regions from oceanographic profiles (CTD, bottles). .....................................................................................................................................13 Figure 10. Dissolved oxygen observed between 0 and 30 m (light blue dots) depth and 30 to 60 m (dark blue open circles) depth in different regions of the Discovery Islands. ..........................15 Figure 11. Water dissolved oxygen observed on Atlantic Salmon farms located in the Discovery Islands. .....................................................................................................................................16 Figure 12. Vertical distribution of dissolved oxygen in the nine regions from oceanographic profiles (CTD, bottles). ..............................................................................................................17 Figure 13. Seasonally-averaged, 9-19 m flows at nine ADCP mooring sites. ............................19 Figure 14. Monthly average discharge for the Homathko (1957 to 2012), Oyster (1974 to 2012) and Salmon (1957 to 2012) rivers in the Discovery Island area, BC. .........................................21 Figure 15. Weather station locations where wind speed and direction data were collected and analysed for the two year period 2010-2011. ............................................................................22 Figure 16. Wind roses, where wind speed is in units of m s-1 and wind direction is the direction from which the wind is blowing, computed from data collected in 2010 and 2011 at selected stations within the study area. ...................................................................................................23 Figure 17. Solar radiation measured in 2010 and 2011 at Cinque and Henrietta in the Discovery Islands. .....................................................................................................................................25 Figure 18. Solar radiation data from the Cinque weather station in the
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